Narrative:

While cruising at FL330 in VMC conditions we began to get whining noise from under flight deck floor. This noise progressively got louder. After about 10 minutes we began to feel vibrations on floor in flight deck. Cabin crew could then hear noise in forward cabin as well. I put in a request for dispatch to call me on VHF and include maintenance (mx) on the line. While dispatch was getting maintenance on line we began to smell odor of hot wires or electrical components. This became stronger pretty quickly. I began to survey alternate options. Determined best options based on nd display and mcdu were ZZZ about 70 miles east and ZZZ1 about 160 west. I decided on ZZZ and advised dispatch of deteriorating conditions when he returned to frequency with mx. He agreed that ZZZ was good diversion and stated he would advise all necessary parties and send landing data. I transferred controls to first officer (first officer); [notified ATC]; and set up FMGC for approach while first officer worked on descent. Briefed cabin crew of diversion with test items stating cabin prep was not required. About halfway thru descent to ZZZ the avionics cooling blower fan ceased and the circuit breaker tripped. With this; the fumes and noise stopped. Normal landing on runway xx and taxi to gate. Fire rescue crews remained on scene until mx could open compartment to examine cooling fan. Passengers deplaned using jetway.

Related reports:

Google
 

Original NASA ASRS Text

Title: A320 flight crew reported diverting due to smoke and fumes from an avionics cooling blower fan malfunction.

Narrative: While cruising at FL330 in VMC conditions we began to get whining noise from under flight deck floor. This noise progressively got louder. After about 10 minutes we began to feel vibrations on floor in flight deck. Cabin crew could then hear noise in forward cabin as well. I put in a request for dispatch to call me on VHF and include maintenance (MX) on the line. While dispatch was getting maintenance on line we began to smell odor of hot wires or electrical components. This became stronger pretty quickly. I began to survey alternate options. Determined best options based on ND display and MCDU were ZZZ about 70 miles east and ZZZ1 about 160 west. I decided on ZZZ and advised dispatch of deteriorating conditions when he returned to frequency with MX. He agreed that ZZZ was good diversion and stated he would advise all necessary parties and send landing data. I transferred controls to FO (First Officer); [notified ATC]; and set up FMGC for approach while FO worked on descent. Briefed cabin crew of diversion with TEST items stating cabin prep was not required. About halfway thru descent to ZZZ the avionics cooling blower fan ceased and the CB tripped. With this; the fumes and noise stopped. Normal landing on runway XX and taxi to gate. Fire rescue crews remained on scene until MX Could open compartment to examine cooling fan. Passengers deplaned using jetway.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.